Ok, you seem very distressed by the horrors of the war and that is understandable. I think everyone is. No one wants it.
But this post is based on a lot of things that aren't true.
The Kingdom of Israel existed on that land since the 9th century BCE alongside Judah. It's not a country that never was. There was a bit of back and forth, Jews got banished to Babylon, got sent back to Judah (return to Zion - hence Zionism) rebuilt the temple that had been destroyed. Then there were a number of wars.
Hadrian came along, killed the vast majority of Jews and renames the whole area Syria Palestina.
However, a population of Jewish people remained in the area, being persecuted on and off by various ruling powers in a variety of different ways, often having to display their Jewishness (yellow belt, golden calf symbol etc.).
Other Jews who had left the area get occasionally persecuted and expelled from various countries (there's a map around somewhere, it's almost weirdly impressive how many countries Jews have been expelled from). In the 1400 the Ottoman empire actually invited Jews to return to the area, after they got expelled from some European countries which made a nice change.
There's another significant migration of Jewish people back to the area is the 1700s too. Then again in the late 1800s. Unsurprisingly, elsewhere in the world, they were not being treated particularly well.
Obviously then there is the situation around the Ottoman empire and the mandate etc. and the people who moved due to this especially after the events of the second world war. Then the people who moved after it.
So which ones should "go home" and where to? Many people who live in Israel have ties to that area going back many hundreds of years.